1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include <sys/types.h>
30#include <sys/systm.h>
31#include <sys/errno.h>
32#include <sys/loadavg.h>
33#include <sys/zone.h>
34#include <sys/pool_pset.h>
35
36/*
37 * Extract elements of the raw avenrun array from the kernel for the
38 * implementation of getloadavg(3c)
39 */
40int
41getloadavg(int *buf, int nelem)
42{
43	int *loadbuf = &avenrun[0];
44	int loadavg[LOADAVG_NSTATS];
45	int error;
46
47	if (nelem < 0)
48		return (set_errno(EINVAL));
49	if (nelem > LOADAVG_NSTATS)
50		nelem = LOADAVG_NSTATS;
51
52	if (!INGLOBALZONE(curproc)) {
53		mutex_enter(&cpu_lock);
54		if (pool_pset_enabled()) {
55			psetid_t psetid = zone_pset_get(curproc->p_zone);
56
57			error = cpupart_get_loadavg(psetid, &loadavg[0], nelem);
58			ASSERT(error == 0);	/* pset isn't going anywhere */
59			loadbuf = &loadavg[0];
60		}
61		mutex_exit(&cpu_lock);
62	}
63
64	error = copyout(loadbuf, buf, nelem * sizeof (avenrun[0]));
65	if (error)
66		return (set_errno(EFAULT));
67	return (nelem);
68}
69